Issue |
A&A
Volume 425, Number 3, October III 2004
|
|
---|---|---|
Page(s) | 949 - 954 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20040490 | |
Published online | 28 September 2004 |
A study of the long-term flux density variation of PSRs B0329+54 and B1508+55
1
Department of Astronomy, Peking University, Beijing 100871, PR China e-mail: aliyi@ms.xjb.ac.cn
2
Urumqi Observatory,the National Astronomical Observatories, the Chinese Academy of Sciences, Urumqi 830011, PR China
3
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, PR China
Received:
22
March
2004
Accepted:
25
May
2004
We have observed the flux densities of PSRs B0329+54 and B1508+55
for 460 days at 327 MHz using the 25 m telescope of NAOC
Urumqi Observatory. The flux density time series and the
corresponding structure functions are presented. Our observational
results at 327 MHz and other observations at 74 MHz and 610 MHz
are compared with the predictions of the refractive scintillation
theory. The frequency dependence of the refractive scintillation
parameters for PSR B0329+54 has been investigated. The results
show that the long-term flux density modulations of PSR B0329+54
at the three frequencies are best described by a Kolmogorov
spectrum for electron density inhomogeneities. For PSR B1508+55,
we suggest that the spectrum of the electron density fluctuation
has a power exponent .
Key words: stars: pulsars: individual: PSR B0329+54, PSR B1508+55 / ISM: structure / plasmas / turbulence
© ESO, 2004
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